Benson, Margaret (1912). «Cordaites Felicis, sp. nov., a Cordaitean Leaf from the Lower Coal Measures of England». Annals of Botany. os-26 (1): 201–207. ISSN0305-7364. doi:10.1093/oxfordjournals.aob.a089385
Benson, Margaret (1912). «Cordaites Felicis, sp. nov., a Cordaitean Leaf from the Lower Coal Measures of England». Annals of Botany. os-26 (1): 201–207. ISSN0305-7364. doi:10.1093/oxfordjournals.aob.a089385